Niall Benvie / Photograph of flowering Restharrow (Ononis sp)manipulated and text added to represent illustrated book page. Scotland, UK, July

Jerry Monkman / Nature Conservancy employees cutting back Japanese knotweed (Fallopia japonica) in an invasive species eradication effort on the TNC's Silverweed Seep preserve in Plainfield, New Hampshire, USA.

Tim Laman / Entomologist, Vojtech Novotny, examining moth specimens in the reference collection at the field laboratory at Mu Village, Chimbu Province, Papua New Guinea. 2005

Tom Vezo / Scrub jay {Aphelocoma coerulescens} on birdwatcher's reference book, Florida, USA

Tom Vezo / Scrub jay {Aphelocoma coerulescens} on birdwatcher's head, NB reference book, Florida, USA

Paul D Stewart / Hand coloured copperplate engraving from William Buckland's contribution to the Bridgewater Treatises ' Geology and Mineralogy Considered with Reference to Natural Theology'. Pickering (1836). In this...

Paul D Stewart / Detail from a folding hand coloured copperplate engraving from William Buckland's contribution to the Bridgewater Treatises ' Geology and Mineralogy Considered with Reference to Natural Theology'. Pic...

Paul D Stewart / Three toed sloth (Bradypus tridactylus). Skeleton of a three toed sloth, or 'Ai', copperplate engraving from Cuvier's 'Ossamens Fossiles' 1812. Cuvier saw that the key to understanding fossils was to...

Paul D Stewart / Illustration of skeleton of a hippopotamus, (Hippopotamus amphibius) skelton, copperplate engraving from Cuvier's 'Ossamens Fossiles'. Cuvier saw that the key to understanding fossils was to relate th...

Paul D Stewart / Elephant skeleton engraving in Cuvier's 'Ossamens Fossiles' (1812). Cuvier, the master of comparative anatomy, referenced modern species with extinct fossils to reveal their affinities and differences...

Paul D Stewart / Illustration of bear skulls of living and extinct species, engraving in Cuvier's 'Ossamens Fossiles' (1812). Cuvier, the master of comparative anatomy, referenced modern species with extinct fossils t...

Paul D Stewart / Copper plate illustration with contemporary hand colouring, possibly of an orang utan (Pongo pygmaeus), printed 1757. 'The satier, savage, wild man, pigmy, orang-autang, chimp-anzee & c. '. From 'Glea...